# @Author: Eric Ito
# @Date: 1/28/2009
# @Name: Project Euler Problem 20

"""
Find the sum of the digits in 100!

"""

from util import fact

def main():
	longNum = fact(100)
	sum = 0
	for digit in str(longNum):
		sum += int(digit)
	print sum

if __name__ == "__main__":
	main()